JPH0644933Y2 - Paper ejection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper discharge device in a printer, a copying machine, or the like.

[Prior Art] Conventionally, in order to improve the discharge property of the paper and to allow the discharged paper to be neatly stacked in the paper storage stacker, both edges of the discharged paper are curved to increase rigidity. Such a paper ejection device has been proposed. Such bending of the paper to give it rigidity is generally called "stiffness". As shown in FIG. 5, a sheet discharging device configured to perform such a waist attachment includes one of the discharging rollers 2a and 2b for nipping and conveying the sheet 1.
Large-diameter portions 3 are formed outside the discharge rollers 2b corresponding to both sides of the sheet 1 so as to contact only the sheet 1, and the large-diameter portions 3 bend both side edges of the sheet 1 to move the sheet 1 in the traveling direction. There are some that are designed to sit down.

[Problems to be solved by the invention]

However, in the above-described conventional paper discharge device, there is a problem that the paper 1 is folded (streak) particularly when the paper path on the upstream side of the discharge rollers 2 and 2b is curved. That is, when the paper path on the upstream side of the discharge rollers 2a and 2b is curved, the paper 1 is placed in the width direction orthogonal to the advancing direction at this portion, and then advances at the large diameter portion 3 of the discharge roller 2b. Since the waists are attached in different directions, streaks occur in the part where the waists in the two different directions are combined.

The present invention has been made in view of such a conventional problem, and an object thereof is to provide a sheet discharging device appropriately configured so that the sheet can be effectively seated without generating streaks. .

[Means for solving problems]

In order to achieve the above object, the paper discharge device of the present invention is
A pair of rollers that nips and ejects a sheet in a predetermined direction; a waisting roller that is provided in the vicinity of the roller pair and that supports the sheet in the ejection direction; and a roller that is provided upstream of the waisting roller and is curved. It is characterized in that it has a guide that forms a paper path and an elastic member that is provided in the vicinity of the upstream side of the waist attachment roller and that presses the conveyed paper toward the guide.

[Operation] In such a configuration, the paper is curved by passing through the paper path formed by the guide provided on the upstream side of the waisting roller, that is, in a state where the paper is stretched in the width direction orthogonal to the traveling direction. Be transported. However, since the elastic member presses the paper against the guide, the width of the paper is weakened in the width direction before reaching the waist forming roller. Does not occur.

〔Example〕

FIG. 1 is a schematic side view showing an embodiment of the present invention. In this embodiment, a sheet on which an image is formed in a printer, a copying machine, etc. is conveyed by a pair of conveying rollers 12a and 12b through a guide 11a and 11b extending in the vertical direction, and this is guided by a guide 13 and a guide 14. And a pair of discharge rollers 16 and 17 for discharging in a substantially horizontal direction through a curved paper path between the rollers 15 and 15.

FIG. 2 is a front view of the discharge rollers 16 and 17 as seen from the downstream side in the paper discharge direction. The upper discharge roller 16 is a frame 18,1
It has a shaft 20 rotatably supported between 9 shafts. Two rollers 21a and 21b made of, for example, rubber and having the same diameter are fixed to the shaft 20 so as to be separated from each other between the frames 18 and 19, and between the frame 18 and the roller 21a and between the rollers 21a and 21b. Between the roller 21b and the frame 19, waist rollers 22a, 22b and 22c having a diameter larger than that of the rollers 21a, 21b are fixed. A gear 23 is fixed to the end of the shaft 20 protruding from the frame 18, and the shaft is driven by a driving means (not shown) through the gear 23.
Rotate 20 in the given direction.

On the other hand, the lower discharge roller 17 is provided with a shaft 24 which is slidably provided between the frames 18 and 19 so as to be movable in parallel to a direction in which the lower discharge roller 17 comes into contact with and separates from the upper discharge roller 16. This shaft 24 has an upper roller
Two rollers 25a and 25b of the same shape made of, for example, a plastic tech are rotatably provided so as to contact the rollers 21a and 21b, respectively, and are provided between the frame 18 and the roller 25a and between the rollers 25b.
And the upper frame between the frame 19 and the waist rollers 22a, 22
Waist rollers 26a and 26b having a diameter larger than that of the rollers 25a and 25b are rotatably provided on the outer side of c. Also this axis 24
At both ends protruding from the frames 18 and 19, the rollers 25a and 27b attached to the frames 18 and 19 respectively
The a and 25b are urged so as to contact the corresponding rollers 21a and 21b, respectively.

With the above configuration alone, when the paper is to be discharged through the transport rollers 12a and 12b and the discharge rollers 16 and 17, the paper first moves in the width direction orthogonal to the transport direction in the curved paper path by the guides 13, 14 and 15. Then, the discharge rollers 16 and 17 are stretched in the conveying direction, that is, in the discharge direction at the portions of the rollers 22a, 22b, 22c and 26a, 26b with the waist. For this reason, as shown in FIG. 3, portions 28a, 28b, 28 where hips having different directions collide with each other in the vicinity of the upstream side of the hip rollers 22a, 22b, 22c and 26a, 26b.
(Indicated by a circle) Part 28 on both sides that has particularly strong waist in the discharge direction
Streaks are generated on the sheet 29 along the traveling direction at the positions a and 28c corresponding to the waisted rollers 22a and 22c.

Therefore, in this embodiment, waist rollers 22a, 22b, 22c and 2 are attached.
Of the parts 28a, 28b, 28c near the upstream side of 6a, 26b where the waists in two different directions collide, the waists in the discharge direction are particularly strong in the parts 28a and 28c on both sides where the waist in the discharge direction is particularly strong. In order to weaken the position of the paper 29 near the inflection point of the wave with waist in both directions, the elastic members 30a, 30b are placed on the lower side of the paper 29 through the paper 29 as shown in FIGS. 1 and 2. The guides 13 are pressed to forcibly flatten each.

The elastic members 30a, 30b are made of, for example, a resin such as nylon having a thickness of about 1 mm, and as shown in FIG. 4, one end of the elastic member 30a, 30b is fixed to the upper guide 15 with an eyelet 31, and the other end is fixed to the paper 29.
Is pressed in surface contact with the lower guide 13 with an elastic force (for example, 80 gf or less) that allows the passage of the.

With this configuration, even if the paper 29 is stretched in the width direction on the upstream side of the discharge rollers 16 and 17, the stretchable elastic members 30a and 30b in the discharge direction near the upstream sides of the waist rollers 22a and 22c are elastic members 30a and 30b.
Since it is weakened by the action of, the paper 29 does not have an undesired streak. Further, the paper 29 is composed of waist rollers 22a, 22
In c, the waist is effectively supported in the discharge direction on the downstream side, and on the other waisted rollers 22b, 26a, 26b in the discharge direction on the upstream side and the downstream side, there is no hindrance to the discharge performance.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications and changes can be made. For example, the elastic members 30a and 30b for forcing the attitude of the paper 29 may be attached to the lower guide 13 so that the attitude of the paper 29 is forced between the upper guide 15. In addition, waist rollers 22a,
22b, 22c and 26a, 26b may be provided on the shafts different from the shafts 20 and 24 in the vicinity of the rollers 21a, 21b and 25a, 25b.

[Effect of device]

According to this invention, even if the paper is laid in the width direction on the upstream side of the garment roller, the paper can be effectively groped and discharged without causing an undesired stripe.

[Brief description of drawings]

 FIG. 1 is a diagrammatic side view showing an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a view for explaining generation of streaks, and FIG. FIG. 5 is a perspective view of a member, and FIG. 5 is a view showing a conventional technique. 11a, 11b …… Guide, 12a, 12b …… Conveying rollers 13,14,15 …… Guide, 16,17 …… Discharging roller 18,19 …… Frame, 20 …… Axis 21a, 21b …… Roller 12a, 22b , 22c …… Roller with waist 23 …… Gear, 24 …… Shaft 25a, 25b …… Roller 26a, 26b …… Roller with waist 27a, 27b …… Spring, 29 …… Paper 30a, 30b …… Elastic member, 31 …… Eyelet

Claims (1)

[Scope of utility model registration request] 1. A pair of rollers for nipping and ejecting a sheet in a predetermined direction, a waisting roller provided in the vicinity of the roller pair for supporting the sheet in the discharging direction, and upstream of the waisting roller. A paper discharge characterized by comprising: a guide that is provided to form a curved paper path; and an elastic member that is provided near the upstream side of the waist mounting roller and presses the conveyed paper toward the guide. apparatus.